Dependency Injection (DI)

🔌 8. Dependency Injection (DI) in .NET

DI is a core pattern for building testable and maintainable software.

interface IEmailService
{
    void Send(string msg);
}

class EmailService : IEmailService
{
    public void Send(string msg) => Console.WriteLine($"Sent: {msg}");
}

class Notification
{
    private readonly IEmailService _email;
    public Notification(IEmailService email) => _email = email;
    public void Notify() => _email.Send("Hello!");
}

🔹 Registering with .NET Core DI

services.AddTransient<IEmailService, EmailService>();